made of recyclable and environmentally XPE foam. XPE has durability and elasticity, no fading, no smell, waterproof and moisture-proof, which can protect you or your backpack from dirt. No more standing on dirty floors while changing and sitting on dirty benches. Expanded size: 15″x11″x0.4″, folding size: 5.5″x4″x2.4″, convenient to carry when you are out. Suit for outdoor activities, such as picnics, camping, hiking, backpack, mountaineering, hiking sports, and a seat cushion pad, or standing mat.